There were two crab fishermen sitting on a dock.
Both with a line with bait and a bucket to hold the caught crab. The first fisherman would catch the crab on his line, hoist them up, place them in the bucket and quickly put a lid on the bucket so they wouldn’t escape.

The second fisherman would catch his crab the same way, hoist them up and place them in his bucket. Oddly though, he didn’t use a lid to contain them within the bucket.

The first fisherman looked at this with great wonder. “How are you able to keep those crab in the bucket without having them escape. To which the second fisherman exclaimed, “Oh, these are Blogger Crabs. When one attempts to climb to the top, the others all gang up on him and pull him back down”